It all depends on width and offset of the 18" rim. As well as the amount of drop.

A couple months ago I installed Sparco Assetto Gara 18" that are 7.5" wide with 35mm offset. I'm on coilovers and have maybe a finger gap between the tire and rear fender, and pretty well flush in front. I'm running 205/40/18 tires.

Let's just say that I've had to dremel out the joint between the front bumper and front fender, as well as the rear bumper and rear fender.... just to make clearance otherwise I'd rub. Even now it still rubs in the back on really big dips and if I have someone else in the car with me.

I roll on 18x7.5 et45. Which was originally on a SVT before I bought them.

The tire size is 215/40 18.

I have a two inch drop which is 1.5 iches more than a SVT and I have no rubbing issues.

215/40R18 is what I would sell you if you called in looking to go to 18" As long as the wheel is 7"-8.5" wide you should have any problems. We even show an Eibach sportline kit that would be a 2"F and 2.2"R drop. We don't like selling kits that will cause rubbing problems so I think you should be fine.

on an svt the closest overall diameter to stock is a 215/40/18 that Julian recommended. I have also run a 125/35/18 but the speedometer will be a little off (it is also the closet overall diameter to stock for a standard mk1 focus)

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